Prof. Lechner is the inventor of new types of heliodons that are invaluable for teaching and designing solar responsive buildings. Besides being an invited speaker in the United States, he has been invited to speak in the following countries: Canada; Thailand 4 times; Korea 5 times; China 3 times; Malaysia 3 times; Hong Kong; Singapore; Indonesia; Japan; Philippines; UAE; Iran; Brazil, Ecuador, Italy; Finland; Estonia; Macedonia; Turkey; Pakistan 2 times; and the UK 2 times.

He is available for lectures, workshops, and mini courses anywhere in the world. The topics are low-energy design, solar responsive design, architecture and climate change, and how to get the most out of your heliodon.